Luminous keyboard

ABSTRACT

A luminous keyboard includes a lateral-emitting type illumination element, a light guide panel, a sensing circuit pattern, a light-transmissible substrate, a supporting plate, and plural keys. When one of the keys is moved toward the sensing circuit pattern, the sensing circuit pattern generates a corresponding non-contact key signal. The lateral-emitting type illumination element is used for providing a light beam to the light guide panel. Consequently, the light beam can be diffused to the whole light guide panel. The light guide panel has plural light-guiding dots for collecting and scattering the light beam. The light-transmissible substrate is arranged between the light guide panel and the plural keys, and has plural light diffusion structures corresponding to the plural keys. The light beam scattered upwardly by each light-guiding dot is sequentially transmitted through the corresponding light diffusion structure and the supporting plate and directed to the corresponding key.

FIELD OF THE INVENTION

The present invention relates to a luminous keyboard, and moreparticularly to a luminous keyboard with an illuminating function.

BACKGROUND OF THE INVENTION

Recently, with the increasing development of information industries,portable information devices such as notebook computers, mobile phonesor personal digital assistants are widely used in many instances. Incase that a portable information device is used in a dim environment,the numbers and the characters marked on the keys of the keyboard of theportable information device are not clearly visible. In other words, thedim environment becomes hindrance from operating the keyboard. Inaddition, if the numbers and the characters marked on the keys of thekeyboard are reluctantly viewed in the dim environment, the user isreadily suffered from vision impairment. For solving these drawbacks, aluminous keyboard has been disclosed. The luminous keyboard can be usedin the dim environment in order to enhance the applications thereof.Moreover, by changing the layout of the luminous regions of the luminouskeyboard, the information device having the luminous keyboard is moreaesthetically-pleasing and thus the competiveness thereof is enhanced.

FIG. 1 is a schematic cross-sectional view illustrating a conventionalluminous keyboard. As shown in FIG. 1, the luminous keyboard 1 comprisesa reflecting plate 11, a light guide plate 12, a supporting plate 13, amembrane wiring board 14, plural keys 15, and plural lateral-emittingtype illumination elements 16. The membrane wiring board 14 comprises alower wiring plate 141, an upper wiring plate 142, and an intermediateplate 143. The intermediate plate 143 is arranged between the lowerwiring plate 141 and the upper wiring plate 142. The lower wiring plate141, the intermediate plate 143 and the upper wiring plate 142 are allmade of a transparent light-guiding material. The transparentlight-guiding material is for example polycarbonate (PC) or polyethyleneterephthalate (PET).

Please refer to FIG. 2, which is a schematic exploded view illustratinga membrane wiring board of the conventional luminous keyboard of FIG. 1.The lower wiring plate 141 comprises a first circuit pattern 1411. Thefirst circuit pattern 1411 comprises plural silver paste conductor lines14111 and plural lower contacts 14112. The upper wiring plate 142comprises a second circuit pattern 1421. The second circuit pattern 1421comprises plural silver paste conductor lines 14211 and plural uppercontacts 14212. The intermediate plate 143 comprises plural perforations1431 corresponding to the plural lower contacts 14112 and the pluralupper contacts 14212, respectively. Each of the upper contacts 14212 andthe corresponding lower contact 14112 are collectively defined as amembrane switch 144.

The supporting plate 13 is disposed under the membrane wiring board 14.In addition, the supporting plate 13 comprises plural openings 131, afirst fixing structure 132, and a second fixing structure 133. Each ofthe keys 15 comprises a keycap 151, an elastic element 152, and ascissors-type connecting element 153. The keycap 151 comprises a firstkeycap connecting structure 1511 and a second keycap connectingstructure 1512. The scissors-type connecting element 153 comprises afirst frame 1531 and a second frame 1532. In addition, the elasticelement 152 is arranged between the keycap 151 and the membrane wiringboard 14.

The membrane wiring board 14 further comprises apertures 145 and 146(see FIG. 1). The first fixing structure 132 and the second fixingstructure 133 are penetrated through the apertures 145 and 146,respectively. A first end 15311 of the first frame 1531 is connected tothe second fixing structure 133, and a second end 15312 of the firstframe 1531 is connected to the first keycap connecting structure 1511.In addition, a first end 15321 of the second frame 1532 is connected tothe first fixing structure 132, and a second end 15322 of the secondframe 1532 is connected to the second keycap connecting structure 1512.

As any key 15 is depressed and moved downwardly relative to thesupporting plate 13, the first frame 1531 and the second frame 1532 ofthe scissors-type connecting element 153 are switched from anopen-scissors state to a folded state. Moreover, as the keycap 151 ismoved downwardly to compress the elastic element 152, the correspondingupper contact 14212 is pushed by the elastic element 152. Consequently,the upper contact 14212 is penetrated through the correspondingperforation 1431 to be contacted with the corresponding lower contact14112. Under this circumstance, the corresponding membrane switch 144 iselectrically conducted, and thus the luminous keyboard 1 generates acorresponding key signal. When the depressing force exerted on the key15 is eliminated, an elastic force provided by the elastic element 152is acted on the keycap 151. In response to the elastic force, the keycap151 is moved upwardly relative to the supporting plate 13. Under thiscircumstance, the first frame 1531 and the second frame 1532 of thescissors-type connecting element 153 are switched from the folded stateto the open-scissors state, and the keycap 151 is returned to itsoriginal position.

Moreover, the lateral-emitting type illumination elements 16 are locatedat bilateral sides of the light guide plate 12 for emitting light beams.The light beams are incident into the light guide plate 12. The lightguide plate 12 is disposed over the reflecting plate 11. Moreover,plural light-guiding dots 121 are formed on a bottom surface of thelight guide plate 12 for collecting and scattering the light beams. Thelight-guiding dots 121 are aligned with corresponding keys 15. After thelight beams are incident into the light guide plate 12, the light beamsare diffused into the whole light guide plate 12. Due to the inkproperties of the light-guiding dots 121, the light beams will bescattered upwardly and downwardly. The portions of the light beams thatare scattered upwardly will be sequentially transmitted through theopenings 131 of the supporting plate 13 and the membrane wiring board 14and then projected to the plural keys 15. The portions of the lightbeams that are scattered downwardly will be reflected by the reflectingplate 11, and the reflected light beams are directed upwardly.Consequently, the light beams provided by the illumination elements 16can be well utilized to illuminate the plural keys 15. However, theconventional luminous keyboard 1 still has the following drawbacks.

Firstly, since the luminous keyboard 1 comprises too many components, itis difficult to reduce the overall thickness of the luminous keyboard 1.In other words, the conventional luminous keyboard 1 fails to meet therequirements of light weightiness, slimness and miniaturization.

Secondly, since the travelling distance of the scissors-type connectingelement 153 is long, the luminous keyboard 1 should have sufficientspace to permit normal operations of the scissors-type connectingelement 153. The necessary space is detrimental to the reduction of thethickness of the luminous keyboard 1. In other words, the conventionalluminous keyboard 1 fails to meet the requirements of light weightiness,slimness and miniaturization.

Recently, a capacitive sensing keyboard was disclosed for solving theabove drawbacks of the conventional luminous keyboard 1. As the keycapis depressed, the electric field of a capacitive key switch of a circuitboard of the capacitive sensing keyboard is changed. Due to the changeof the electric field, the circuit board generates a corresponding keysignal. Since the scissors-type connecting element is not an essentialcomponent of the capacitive sensing keyboard, if the scissors-typeconnecting element is not used, the overall thickness of the capacitivesensing keyboard is effectively reduced. However, since the currentcapacitive sensing keyboard has no illuminating function, if thecapacitive sensing keyboard is used in the dim environment, someproblems may occur. For example, since the numbers and the charactersmarked on the keys of the capacitive sensing keyboard are not clearlyvisible, the dim environment becomes hindrance from operating thecapacitive sensing keyboard or the user is readily suffered from visionimpairment.

SUMMARY OF THE INVENTION

The present invention relates to a luminous keyboard, and moreparticularly to a luminous keyboard having enhanced light utilizationefficiency and using a non-contact sensing technology.

In accordance with an aspect of the present invention, there is provideda luminous keyboard. The luminous keyboard includes a sensing circuitpattern, at least one key, a lateral-emitting type illumination element,a light guide panel, a supporting plate, and a light-transmissiblesubstrate. The sensing circuit pattern is used for generating at leastone non-contact key signal. When the at least one key is depressed, theat least one non-contact key signal is correspondingly generated by thesensing circuit pattern. The lateral-emitting type illumination elementis used for providing a light beam. The lateral-emitting typeillumination element is located at a lateral side of the light guidepanel. The light guide panel has at least one light-guiding dot forcollecting and scattering the light beam from the lateral-emitting typeillumination element. The supporting plate is used for connecting andsupporting the at least one key. The supporting plate has at least onelight-transmissible part corresponding to the at least one key. Thelight-transmissible substrate is arranged between the supporting plateand the light guide panel. The light-transmissible substrate includes atleast one light diffusion structure corresponding to the at least onekey for changing an optical path of the light beam from the at least onelight-guiding dot, so that the light beam from the at least onelight-guiding dot is sequentially transmitted through the at least onelight diffusion structure and the at least one light-transmissible partand then directed to the at least one key.

The above objects and advantages of the present invention will becomemore readily apparent to those ordinarily skilled in the art afterreviewing the following detailed description and accompanying drawings,in which:

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a schematic cross-sectional view illustrating a conventionalluminous keyboard;

FIG. 2, which is a schematic exploded view illustrating a membranewiring board of the conventional luminous keyboard of FIG. 1;

FIG. 3 is a schematic side view illustrating a luminous keyboardaccording to a first embodiment of the present invention;

FIG. 4 is a schematic exploded view illustrating a sensing module of theluminous keyboard of FIG. 3;

FIG. 5 is a schematic top view illustrating a keycap of the luminouskeyboard of FIG. 3;

FIG. 6 schematically illustrates an example of a light diffusionstructure used in the luminous keyboard of the present invention;

FIG. 7 schematically illustrates another example of a light diffusionstructure used in the luminous keyboard of the present invention;

FIG. 8 schematically illustrates a further example of a light diffusionstructure used in the luminous keyboard of the present invention;

FIG. 9 is a schematic side view illustrating a luminous keyboardaccording to a second embodiment of the present invention;

FIG. 10 is a schematic cross-sectional view illustrating a luminouskeyboard according to a third embodiment of the present invention;

FIG. 11 is a schematic side view illustrating a luminous keyboardaccording to a fourth embodiment of the present invention;

FIG. 12 is a schematic side view illustrating a luminous keyboardaccording to a fifth embodiment of the present invention;

FIG. 13 is a schematic side view illustrating a luminous keyboardaccording to a sixth embodiment of the present invention;

FIG. 14 is a schematic side view illustrating a luminous keyboardaccording to a seventh embodiment of the present invention;

FIG. 15 is a schematic exploded view illustrating a key of the luminouskeyboard of FIG. 14;

FIG. 16 is a schematic cutaway view illustrating the key of the luminouskeyboard of FIG. 14, in which the key is not depressed;

FIG. 17 is a schematic cutaway view illustrating the key of the luminouskeyboard of FIG. 14, in which the key is depressed;

FIG. 18 is a schematic exploded view illustrating a key and a supportingplate of a luminous keyboard according to an eighth embodiment of thepresent invention; and

FIG. 19 is a schematic side view illustrating a luminous keyboardaccording to a ninth embodiment of the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT

FIG. 3 is a schematic side view illustrating a luminous keyboardaccording to a first embodiment of the present invention. FIG. 4 is aschematic exploded view illustrating a sensing module of the luminouskeyboard of FIG. 3. FIG. 5 is a schematic top view illustrating a keycapof the luminous keyboard of FIG. 3. Please refer to FIGS. 3, 4 and 5.

From bottom to top, a base 21, a light guide panel 22, a sensing module24, a light-transmissible substrate 26, a supporting plate 23 and pluralkeys 25 of the luminous keyboard 2 are sequentially shown. The luminouskeyboard 2 further comprises a lateral-emitting type illuminationelement 30. The lateral-emitting type illumination element 30 is locatedat a lateral side of the light guide panel 22. The base 21 is used forsupporting the light guide panel 22, the sensing module 24, thesupporting plate 23, the plural keys 25 and the lateral-emitting typeillumination element 30.

The supporting plate 23 is used for connecting and supporting the pluralkeys 25. Each key 25 comprises a keycap 251, a conductive element 252,and a connecting element 253. Each connecting element 253 is arrangedbetween the supporting plate 23 and the corresponding keycap 251 forconnecting the supporting plate 23 and the corresponding keycap 251.Moreover, due to the connecting element 253, the keycap 251 is movableupwardly or downwardly relative to the supporting plate 23. Eachconductive element 252 is connected to a bottom surface of thecorresponding keycap 251, and movable relative to the correspondingkeycap 251. The conductive element 252 is made of conductive material.An example of the conductive material includes but is not limited toconductive foam, metallic material, graphite or metallic paint.Moreover, the keycap 251 comprises at least one light-outputting region2513. For example, the light-outputting region 2513 is alight-outputting symbol region, a light-outputting number region or alight-outputting character region.

Moreover, in this embodiment, the lateral-emitting type illuminationelement 30 is a light emitting diode. Moreover, the light guide panel 22comprises a light guide plate 221. The light guide plate 22 is made ofpolyethylene terephthalate (PET), polycarbonate (PC), thermoplasticpolyurethane (TPU) or polymethylmethacrylate (PMMA), but is not limitedthereto. The lateral-emitting type illumination element 30 is used foremitting a light beam. The light beam is incident into the light guideplate 221. Moreover, plural light-guiding dots 2211 are formed on asurface of the light guide plate 221 for collecting and scattering thelight beam. The light-guiding dots 2211 are aligned with correspondingkeys 25, respectively. After the light beam is incident into the lightguide plate 221, the light beam is diffused into the whole light guideplate 221. Due to the properties (e.g. the ink properties) or thestructures (e.g. microstructures) of the plural light-guiding dots 2211,the light beam will be scattered upwardly and downwardly.

In this embodiment, the supporting plate 23 is a light-transmissiblesupporting plate. For example, the supporting plate 23 is made of alight-transmissible material. The portion of the light beam that isscattered upwardly by the plural light-guiding dots 2211 will besequentially transmitted through the light-transmissible substrate 26and the supporting plate 23 and directed to the plural keys 25, and thenoutputted from the light-outputting region 2513 of the keycap 251. Underthis circumstance, the illuminated symbol, number or character of thekey 25 can be clearly viewed by the user, and thus the operatingdifficulty in the dim environment can be minimized.

Generally, the light-outputting region 2513 is located at a corner ofthe keycap 251. However, since the distance between the supporting plate23 and the keycap 251 is too short, the light beam passing through thesupporting plate 23 fails to be effectively refracted to thelight-outputting region 2513 at the corner of the keycap 251. In otherwords, a greater portion of the light beam is directed to the middleregion of the keycap 251. Under this circumstance, the light utilizationefficiency is still unsatisfied.

For increasing the light utilization efficiency, the light-transmissiblesubstrate 26 further comprises plural light diffusion structures 261.The plural light diffusion structures 261 are aligned with respectivekeycaps 251, and integrally formed with the light-transmissiblesubstrate 26. In particular, the profile of each light diffusionstructure 261 should be specially designed. Consequently, the lightdiffusion structure 261 has a lens profile. For example, the lensprofile is a convex-concave lens profile, but is not limited thereto.That is, by specially designing the profile of the light diffusionstructure 261, the light diffusion structure 261 has the lens function.Consequently, after the light beam is transmitted through the lightdiffusion structure 261, the optical path of the light beam is changed.That is, the light beam passing through the light diffusion structure261 can be directed toward the light-outputting region 2513 of thekeycap 251. The above way of diffusing the light beam to thelight-outputting region 2513 of the keycap 251 by the light diffusionstructure 261 is presented herein for purpose of illustration anddescription only. However, those skilled in the art will readily observethat numerous modifications and alterations of the light diffusionstructure 261 may be made according to the practical requirements.

FIG. 6 schematically illustrates an example of a light diffusionstructure used in the luminous keyboard of the present invention. Fordiffusing the light beam to the light-outputting region 2513 of thekeycap 251, the light-transmissible substrate 26 comprises plural lightdiffusion structures 261′ corresponding to the plural keycaps 251. Inthis embodiment, each of the light diffusion structures 261′ is a lens.After the light beam is transmitted through the light-transmissiblesubstrate 26, the light beam is transmitted through the light diffusionstructure 261′ (i.e. the lens), and thus the optical path of the lightbeam is changed. That is, the light beam passing through the lightdiffusion structures 261′ can be directed toward the light-outputtingregion 2513 of the keycap 251.

FIG. 7 schematically illustrates another example of a light diffusionstructure used in the luminous keyboard of the present invention. Fordiffusing the light beam to the light-outputting region 2513 of thekeycap 251, the light-transmissible substrate 26 comprises plural lightdiffusion structures 261″ corresponding to the plural keycap 251. Inthis embodiment, each of the light diffusion structures 261″ comprisesplural microstructures. After the light beam is transmitted through thelight diffusion structure 261″ (i.e. the microstructures 272), theoptical path of the light beam is changed by the microstructures 272.That is, the light beam passing through the light diffusion structures261″ can be directed toward the light-outputting region 2513 of thekeycap 251. As shown in FIG. 7, the microstructures are V-cutstructures. However, the microstructures are not restricted to the V-cutstructures. For example, as shown in FIG. 8, the microstructures of thelight diffusion structures 261′″ are texturing structures. The aboveexamples of the light diffusion structures for diffusing the light beamto the light-outputting region 2513 of the keycap 251 are presentedherein for purpose of illustration and description only, but are notused to limit the scope of the present invention.

Please refer to FIGS. 3 and 4 again. In this embodiment, the luminouskeyboard 2 is a capacitive luminous keyboard, and the sensing module 24is a capacitive sensing module. The sensing module 24 comprises asensing circuit board 241 and a sensing circuit pattern 242. The sensingcircuit pattern 242 is formed on a top surface or a bottom surface ofthe sensing circuit board 241. In this embodiment, the sensing circuitpattern 242 is formed on the top surface of the sensing circuit board241.

For example, the sensing circuit board 241 is a printed circuit boardwith an insulated metal substrate (e.g. the conventional printed circuitboard), but is not limited thereto. The sensing circuit pattern 242comprises plural first electrode patterns 2421 and plural secondelectrode patterns 2422 corresponding to the plural first electrodepatterns 2421, respectively. Each of the plural first electrode patterns2421 and the corresponding second electrode pattern 2422 are separatedfrom each other by a gap. Moreover, each of the plural first electrodepatterns 2421 and the corresponding second electrode pattern 2422 arecollaboratively defined as a capacitive key switch 2423. When thesensing module 24 is electrically conducted, plural electric fieldsbetween the first electrode patterns 2421 and the corresponding secondelectrode patterns 2422 are generated. If one of the electric fields ischanged, the corresponding capacitive key switch 2423 is triggered, sothat the sensing module 24 generates a non-contact key signal. Moreover,the sensing module 24 further comprises plural perforations 243corresponding to the plural light-guiding dots 2211, respectively. Theportion of the light beam that is scattered upwardly may be transmittedthrough the plural perforations 243.

In this embodiment, each first electrode pattern 2421 and thecorresponding second electrode pattern 2422 are discretely arranged onthe same horizontal plane. It is noted that numerous modifications andalterations may be made while retaining the teachings of the invention.For example, in some embodiments, each first electrode pattern 2421 andthe corresponding second electrode pattern 2422 may be discretelyarranged on different horizontal planes. That is, each first electrodepattern 2421 may be disposed over or under the corresponding secondelectrode pattern 2422. Moreover, a spacer layer (e.g. an UV adhesivelayer) is coated or printed on the region between each first electrodepattern 2421 and the corresponding second electrode pattern 2422.Consequently, each first electrode pattern 2421 and the correspondingsecond electrode pattern 2422 are separated from each other vertically.

The way of generating the key signal in the capacitive sensing mannerand the operating principle thereof are well known to those skilled inthe art, and are not redundantly described herein. The configuration ofthe sensing circuit pattern 242 of FIG. 4 is presented herein forpurpose of illustration and description only. It is noted that numerousmodifications and alterations of the sensing circuit pattern 242 may bemade while retaining the teachings of the invention. For example, insome other embodiments, the sensing circuit pattern 242 may be amagnetic sensing circuit pattern or any other comparable non-contactsensing circuit pattern.

In this embodiment, the connecting element 253 of each key 25 is ascissors-type connecting element. Moreover, the scissors-type connectingelement 253 comprises a first frame 2531 and a second frame 2532. Thesupporting plate 23 further comprises a first fixing structure 232 and asecond fixing structure 233. The keycap 251 of each key 25 comprises afirst keycap connecting structure 2511 and a second keycap connectingstructure 2512. A first end 25311 of the first frame 2531 is connectedto the second fixing structure 233, and a second end 25312 of the firstframe 2531 is connected to the first keycap connecting structure 2511.In addition, a first end 25321 of the second frame 2532 is connected tothe first fixing structure 232, and a second end 25322 of the secondframe 2532 is connected to the second keycap connecting structure 2512.It is noted that the connection relationships between the connectingelement 253, the supporting plate 23 and the keycap 251 are presentedherein for purpose of illustration and description only.

Moreover, the plural keys 25 are aligned with the plural capacitive keyswitches 2423, respectively. As any keycap 251 is depressed and moveddownwardly relative to the supporting plate 23, the first frame 2531 andthe second frame 2532 of the corresponding connecting element 253 areswitched from an open-scissors state to a folded state. Moreover, as thekeycap 251 is moved downwardly, the corresponding conductive element 252is moved toward the sensing circuit pattern 242. Under thiscircumstance, the electric field between the corresponding firstelectrode pattern 2421 and the corresponding second electrode pattern2422 is changed. Due to the change of the electric field, thecorresponding capacitive key switch 2423 is triggered. Consequently, thesensing module 24 generates the corresponding non-contact key signal.

In this embodiment, the luminous keyboard 2 further comprises akeycap-restoring means (not shown). When the depressing force exerted onthe keycap 251 is eliminated, the keycap 251 is moved upwardly relativeto the sensing module 24 in response to the keycap-restoring means.Under this circumstance, the first frame 2531 and the second frame 2532are switched from the folded state to the open-scissors state, and thekeycap 251 is returned to its original position. Moreover, thekeycap-restoring means can also provide a feedback tactile feel ofdepressing the keycap 251 to the user. In this embodiment, thekeycap-restoring means is an elastic force or a magnetic force. That is,the keycap 251 is returned to its original position in response to theelastic force or the magnetic force. The way of generating the elasticforce or the magnetic force is well known to those skilled in the art,and is not redundantly described herein.

FIG. 9 is a schematic side view illustrating a luminous keyboardaccording to a second embodiment of the present invention. Except thatthe luminous keyboard 2A of this embodiment further comprises a metallicbottom plate 28, the other components of the luminous keyboard 2A aresimilar to those of the luminous keyboard of the first embodiment, andare not redundantly described herein. The metallic bottom plate 28 isdisposed under the sensing circuit pattern 242 for providing a shieldingeffect. Due to the shielding effect, the interference between theelectric fields of every two adjacent capacitive key switches 2423 canbe inhibited.

Those skilled in the art will readily observe that the metallic bottomplate 28 of the luminous keyboard of the second embodiment may beapplied to the luminous keyboards of the following embodiments whileretaining the teachings of the second embodiment of the presentinvention.

FIG. 10 is a schematic cross-sectional view illustrating a luminouskeyboard according to a third embodiment of the present invention.Except that the luminous keyboard 2B of this embodiment comprises asensing membrane wiring board 244 in replace of the sensing circuitboard 241 of the first embodiment, the other components of the luminouskeyboard 2B are similar to those of the luminous keyboard of the firstembodiment, and are not redundantly described herein. Preferably, thesensing membrane wiring board 244 is made of polyethylene terephthalate(PET), polycarbonate (PC), thermoplastic polyurethane (TPU) orpolymethylmethacrylate (PMMA), but is not limited thereto. Moreover,since the sensing membrane wiring board 244 is made of thelight-transmissible material, the perforations 243 are not essentialcomponents for limiting the scopes of the present invention.

Those skilled in the art will readily observe that the sensing membranewiring board 244 of the luminous keyboard of the third embodiment may beapplied to the luminous keyboards of the above embodiments and thefollowing embodiments while retaining the teachings of the thirdembodiment of the present invention.

FIG. 11 is a schematic side view illustrating a luminous keyboardaccording to a fourth embodiment of the present invention. In comparisonwith the luminous keyboard of the first embodiment, the sensing circuitpattern 242 of the luminous keyboard 2C of this embodiment is directlyformed on a top surface of the light guide panel 22, and the sensingcircuit board 241 is not included in the luminous keyboard 2C. The othercomponents of the luminous keyboard 2C of this embodiment are similar tothose of the luminous keyboard of the first embodiment, and are notredundantly described herein. Moreover, for illustration, the sensingcircuit pattern 242 is formed on the top surface of the light guidepanel 22. It is noted that numerous modifications and alterations may bemade while retaining the teachings of the invention. For example, thesensing circuit pattern 242 may be formed on a bottom surface of thelight guide panel 22 or within the light guide panel 22.

Those skilled in the art will readily observe that the relationships ofthe components of the luminous keyboard of the fourth embodiment may beapplied to the luminous keyboards of the above embodiments and thefollowing embodiments while retaining the teachings of the fourthembodiment of the present invention.

FIG. 12 is a schematic side view illustrating a luminous keyboardaccording to a fifth embodiment of the present invention. Except thatthe luminous keyboard 2D of this embodiment further comprises areflective layer 27, the other components of the luminous keyboard 2Aare similar to those of the luminous keyboard of the third embodiment,and are not redundantly described herein. The reflective plate 27 isdisposed under the light guide panel 22. The portion of the light beamthat is scattered downwardly by the plural light-guiding dots 2211 isprojected to the reflective plate 27 and reflected by the reflectiveplate 27. The reflected light beam is incident into the light guidepanel 22 again. Since the portion of the light beam that is provided bythe lateral-emitting type illumination element 30 and scattereddownwardly by the plural light-guiding dots 2211 is not lost, the lightbeam can be well utilized. Under this circumstance, the lightutilization efficiency of the luminous keyboard 2D is enhanced.

Those skilled in the art will readily observe that the reflective plate27 of the luminous keyboard of the fifth embodiment may be applied tothe luminous keyboards of the above embodiments and the followingembodiments while retaining the teachings of the fifth embodiment of thepresent invention.

FIG. 13 is a schematic side view illustrating a luminous keyboardaccording to a sixth embodiment of the present invention. Except thatthe supporting plate 23E of the luminous keyboard 2E of this embodimentis an opaque supporting plate and the supporting plate 23E has pluralopenings corresponding to the plural keys 25, the other components ofthe luminous keyboard 2E are similar to those of the luminous keyboardof the third embodiment, and are not redundantly described herein. Thelight beam passing through the light diffusion structures 261 istransmitted through the openings and directed toward thelight-outputting region 2513 of the keycap 251.

Those skilled in the art will readily observe that the supporting plate23E of the luminous keyboard of the sixth embodiment may be applied tothe luminous keyboards of the above embodiments and the followingembodiments while retaining the teachings of the sixth embodiment of thepresent invention.

In the above embodiments, the cooperation of the supporting plate 23 or23E and the scissors-type connecting element 253 allows the keycap 251and the conductive element 252 to be moved upwardly or downwardlyrelative to the sensing circuit pattern 24. The way of allowing thekeycap 251 and the conductive element 252 to be moved upwardly ordownwardly relative to the sensing circuit pattern 242 is presentedherein for purpose of illustration and description only. However, thoseskilled in the art will readily observe that numerous modifications andalterations may be made according to the practical requirements. It isnoted that the scissors-type connecting element 253 is not an essentialcomponent for limiting the scopes of the present invention.

Hereinafter, another embodiment of a luminous keyboard will beillustrated with reference to FIGS. 14-47. FIG. 14 is a schematic sideview illustrating a luminous keyboard according to a seventh embodimentof the present invention. FIG. 15 is a schematic exploded viewillustrating a key of the luminous keyboard of FIG. 14. FIG. 16 is aschematic cutaway view illustrating the key of the luminous keyboard ofFIG. 14, in which the key is not depressed. FIG. 17 is a schematiccutaway view illustrating the key of the luminous keyboard of FIG. 14,in which the key is depressed. Except for the following items, the othercomponents of the luminous keyboard 2F of this embodiment are similar tothose of the luminous keyboard of the third embodiment, and are notredundantly described herein.

In comparison with the third embodiment, the scissors-type connectingelement 253 is not included in the luminous keyboard 2F of thisembodiment. Especially, each key 29 comprises a keycap 291, a conductiveelement 292, a key frame 293, and plural elastic arms 294. Each of theelastic arms 294 is a flat strip comprising a static inner arm part2941, a movable outer arm part 2942 and an angular transition part 2943.The movable outer arm part 2942 is perpendicular to the static inner armpart 2941. The angular transition part 2943 is connected between thestatic inner arm part 2941 and the movable outer arm part 2942. The keyframe 293 has a hollow portion 2931. The keycap 291 is embedded into thehollow portion 2931 of the key frame 293. The static inner arm part 2941of each elastic arm 294 is fixed on the bottom of the keycap 291. Themovable outer arm part 2942 of each elastic arm 294 is exposedexternally from the bottom of the keycap 291 and fixed on the key frame293. The angular transition part 2943 of each elastic arm 294 is exposedexternally from a corner of the bottom of the keycap 291.

In case that any keycap 291 is not depressed, the movable outer arm part2942 and the angular transition part 2943 of each elastic arm 294 arenot subjected to deformation (see FIG. 16). As any keycap 291 isdepressed, the angular transition part 2943 of the elastic arm 294 ispressed by the corner of the bottom of the keycap 291. Under thiscircumstance, both of the movable outer arm part 2942 and the angulartransition part 2943 of the elastic arm 294 are subjected to deformation(see FIG. 17). Moreover, as the keycap 291 is moved downwardly, theconductive element 292 is correspondingly moved toward the sensingcircuit pattern 242. Meanwhile, the corresponding capacitive key switchis triggered, and thus the sensing circuit pattern 242 generates thecorresponding non-contact key signal. For clarification and brevity, thecapacitive key switch is not shown. The operations of the capacitive keyswitch are similar to those of the first embodiment, and are notredundantly described herein. When the depressing force exerted on thekeycap 291 is eliminated, an elastic force provided by the correspondingelastic arm 294 is acted on the keycap 291. In response to the elasticforce, the keycap 291 is returned to its original position.

In the luminous keyboard 2F of this embodiment, the scissors-typeconnecting element is not included, but the keycap and the conductiveelement are movable upwardly or downwardly relative to the sensingcircuit pattern. Under this circumstance, the overall thickness of theluminous keyboard can be further reduced. The luminous keyboard ispresented herein for purpose of illustration and description only.However, those skilled in the art will readily observe that the keystructure of the seventh embodiment may be applied to the luminouskeyboards of the above embodiments and the following embodiments whileretaining the teachings of the seventh embodiment of the presentinvention.

FIG. 18 is a schematic exploded view illustrating a key and a supportingplate of a luminous keyboard according to an eighth embodiment of thepresent invention. Except for the following items, the other componentsof the luminous keyboard of this embodiment are similar to those of theluminous keyboard of the first embodiment, and are not redundantlydescribed herein.

In comparison with the first embodiment, the scissors-type connectingelement 253 is not included in the luminous keyboard of the eighthembodiment. Moreover, each key 25G further comprises plural elastic arms254. The plural elastic arms 254 are arranged between the keycap 251 andthe supporting plate 23. Each elastic arm 254 comprises a fixed end 2541and a free end 2542. The fixed end 2541 of each elastic arm 254 isconnected with the supporting plate 23. The free end 2542 of eachelastic arm 254 is connected with the bottom of the keycap 251. As anykeycap 251 is depressed, the free end 2542 of each elastic arm 254 ispressed by the keycap 251. Under this circumstance, the free end 2542 ofeach elastic arm 254 is moved downwardly with the keycap 251, and thefree end 2542 of each elastic arm 254 provides an elastic force to thekeycap 251. When the depressing force exerted on the keycap 251 iseliminated, the keycap 251 is returned to its original position inresponse to the elastic force provided by each elastic arm 254.

However, those skilled in the art will readily observe that the keystructure of the eighth embodiment may be applied to the luminouskeyboards of the above embodiments and the following embodiments whileretaining the teachings of the eighth embodiment of the presentinvention.

FIG. 19 is a schematic side view illustrating a luminous keyboardaccording to a ninth embodiment of the present invention. Except for thefollowing items, the other components of the luminous keyboard 2H ofthis embodiment are similar to those of the luminous keyboard of thethird embodiment, and are not redundantly described herein. Incomparison with the third embodiment, a light-shading structure 20 (e.g.a light-shading ink layer) is formed on an outer surface of thelight-transmissible substrate 26. Consequently, the portion of the lightbeam scattered upwardly by the light-guiding dot 2211 fails to betransmitted through the light-shading structure 20, but the light beamis only transmissible through the portion of the light-transmissiblesubstrate 26 which is not shaded by the light-shading structure 20. Dueto the light-shading structure 20, the light beam fails to be leaked toany place where the light beam is not needed. In this embodiment, thelight-shading structure 20 is formed on the outer surface of thelight-transmissible substrate 26. The luminous keyboard is presentedherein for purpose of illustration and description only. It is notedthat numerous modifications and alterations may be made while retainingthe teachings of the invention. For example, in some other embodiments,the light-shading structure 20 may be formed on an inner surface of thelight-transmissible substrate 26.

However, those skilled in the art will readily observe that thelight-shading structure 20 of the ninth embodiment may be applied to allof the above embodiments while retaining the teachings of the ninthembodiment of the present invention. That is, in all of the aboveembodiments, the light-shading structure 20 may be formed on the surfaceof the light-transmissible substrate 26. Consequently, the portion ofthe light beam scattered upwardly by the light-guiding dot 2211 fails tobe leaked to any place where the light beam is not needed.

In the above embodiments, the sensing circuit pattern is arrangedbetween the light guide panel and the light-transmissible supportingplate, but is not limited thereto. That is, the position of the sensingcircuit pattern is not restricted as long as the sensing circuit patterncan generate the non-contact key signal in response to the downwardmovement of the depressed key. For example, in some embodiments, thesensing circuit board or the sensing membrane wiring board may bedisposed under the light guide panel.

From the above descriptions, the present invention provides a luminouskeyboard. In the luminous keyboard, a light-transmissible substrate withplural light diffusion structures is disposed over a light guide panel.By the plural light diffusion structures, the portion of the light beamscattered upwardly by the light guide panel can be effectively refractedto the light-outputting region of the keycap. Moreover, by thelight-shading structure, the light beam will not be leaked to any placewhere the light beam is not needed. Consequently, the light utilizationefficiency is enhanced. In comparison with the conventional non-sensingkeyboard without the illuminating function, the luminous keyboard of thepresent invention has industrial applicability.

While the invention has been described in terms of what is presentlyconsidered to be the most practical and preferred embodiments, it is tobe understood that the invention needs not be limited to the disclosedembodiment. On the contrary, it is intended to cover variousmodifications and similar arrangements included within the spirit andscope of the appended claims which are to be accorded with the broadestinterpretation so as to encompass all such modifications and similarstructures.

What is claimed is:
 1. A luminous keyboard, comprising: a sensingmembrane wiring board comprising a sensing circuit pattern formed onsaid sensing membrane wiring board for generating at least onenon-contact key signal; at least one key, wherein when said at least onekey is depressed, said at least one non-contact key signal iscorrespondingly generated by said sensing circuit pattern; alateral-emitting type illumination element for providing a light beam; alight guide panel, wherein said lateral-emitting type illuminationelement is located at a lateral side of said light guide panel, and saidlight guide panel has at least one light-guiding dot for collecting andscattering said light beam from said lateral-emitting type illuminationelement; a supporting plate for connecting and supporting said at leastone key, wherein said supporting plate has at least onelight-transmissible part corresponding to said at least one key; and alight-transmissible substrate arranged between said supporting plate andsaid light guide panel, wherein said light-transmissible substratecomprises at least one light diffusion structure corresponding to saidat least one key for changing an optical path of said light beam fromsaid at least one light-guiding dot, so that said light beam from saidat least one light-guiding dot is sequentially transmitted through saidat least one light diffusion structure and said at least onelight-transmissible part and then directed to said at least one key;wherein said sensing membrane wiring board is arranged between saidlight guide panel and said supporting plate; wherein said at least onelight diffusion structure comprises plural microstructures, and saidplural microstructures are formed on said light-transmissible substrate;or wherein said at least one light diffusion structure is at least onelens, and said at least one lens is formed on said light-transmissiblesubstrate; or wherein said at least one light diffusion structure has alens profile, and said at least one light diffusion structure isintegrally formed with said light-transmissible substrate.
 2. Theluminous keyboard according to claim 1, wherein said sensing membranewiring board has at least one perforation corresponding to said at leastone light diffusion structure and wherein said light beam from said atleast one light-guiding dot is sequentially transmitted through said atleast one perforation, said at least one light diffusion structure, saidat least one light-transmissible part and then directed to said at leastone key.
 3. The luminous keyboard according to claim 1, wherein saidsensing membrane wiring board is made of polyethylene terephthalate(PET), polycarbonate (PC), thermoplastic polyurethane (TPU) orpolymethylmethacrylate (PMMA).
 4. The luminous keyboard according toclaim 1, wherein said sensing circuit pattern comprises at least onefirst electrode pattern and at least one second electrode pattern,wherein when said sensing circuit pattern is electrically conducted, anelectric field between said at least one first electrode pattern andsaid at least one second electrode pattern is generated, wherein as saidat least one key is depressed and moved toward said sensing circuitpattern, said electric field is changed, so that said at least onenon-contact key signal is correspondingly generated by said sensingcircuit pattern.
 5. The luminous keyboard according to claim 1, whereinsaid at least one key comprises: a keycap exposed outside said luminouskeyboard; and a conductive element arranged between said keycap and saidsensing circuit pattern, and movable with said keycap, wherein as saidkeycap is depressed, said conductive element is moved downwardly towardsaid sensing circuit pattern, so that said at least one non-contact keysignal is correspondingly generated by said sensing circuit pattern. 6.The luminous keyboard according to claim 5, wherein said conductiveelement is made of conductive foam, metallic material or metallic paint.7. The luminous keyboard according to claim 5, wherein said at least onekey further comprises a connecting element, and said connecting elementis connected between said supporting plate and said keycap, so that saidkeycap is movable upwardly or downwardly relative to said supportingplate; or wherein said at least one key further comprises plural elasticarms for allowing said keycap to be moved upwardly or downwardlyrelative to said sensing circuit pattern, wherein each of said pluralelastic arm comprises a fixed end connected with said supporting plateand a free end connected with said keycap; or wherein said at least onekey further comprises: a key frame comprising a hollow portion, whereinsaid keycap is embedded into said hollow portion of said key frame; andplural elastic arms for allowing said keycap to be movable upwardly ordownwardly relative to said sensing circuit pattern, wherein each ofsaid plural elastic arms comprises a static inner arm part, a movableouter arm part and an angular transition part, wherein said angulartransition part is connected between said static inner arm part and saidmovable outer arm part.
 8. The luminous keyboard according to claim 1,wherein each of said plural microstructures is a V-cut structure or atexturing structure.
 9. The luminous keyboard according to claim 1,further comprising at least one of a metallic bottom plate and areflective layer, wherein said metallic bottom plate is disposed undersaid sensing circuit pattern, wherein said reflective layer is disposedunder said light guide panel, and said light beam from said light guidepanel is reflected by said reflective layer.
 10. The luminous keyboardaccording to claim 1, wherein said lateral-emitting type illuminationelement is a light emitting diode.
 11. The luminous keyboard accordingto claim 1, wherein said luminous keyboard is a capacitive sensingluminous keyboard.
 12. The luminous keyboard according to claim 1,wherein said supporting plate is a light-transmissible supporting plate.13. The luminous keyboard according to claim 1, further comprising alight-shading structure, wherein said light-shading structure is formedon a surface of said light-transmissible substrate.
 14. The luminouskeyboard according to claim 1, wherein said light-shading structure is alight-shading ink layer.
 15. The luminous keyboard according to claim 1,wherein said at least one light-transmissible part is an opening of saidsupporting plate.